web-player: TypeScript helpers (partial)

Add src/lib/actions/pressable.ts and clickOutside.ts (Svelte actions;
role/tabindex stay static in markup for SSR accessibility, the action
only adds click + Enter/Space) and src/lib/toggle.svelte.ts
(createToggle), used by playlists.svelte.ts and queuePanel.svelte.ts.

format.ts: adds plural(n, one, many); migrates the repo's 15 manual
pluralizations, unifying them to lowercase (visible diff in
Playlists, Home, liked, Explore).

player.svelte.ts: adds toQueueItem, isQueueCurrent, playAllOrToggle,
playShuffled; renames addToQueue -> playNextItem (the old name was
misleading: it inserts next, not at the end). Migrates the 5 places
that repeated the isCurrentQueue/playAll pattern (album, playlist,
liked, mix, Home). Simplifies liked.svelte.ts and recentlyPlayed.ts
with object spread instead of rebuilding every field by hand.

navigation.svelte.ts: adds searchHref (migrates the duplicated
buildHref from TopBar and Explore) and appNavLinks (added; its
adoption in Sidebar/TabsBar is left for a later pass, as noted
there).

menus.svelte.ts: createTrackMenu() replaces the manual context-menu
state (contextMenu + contextMenuStateFor + addToQueue) in Home,
Explore and Mix.

Deliberately left pending: removing tracks.ts's TrackTarget wrapper
and its 8 accessors is deferred — it's the riskiest change in the
plan, touches types across Home/Explore/Mix/menus, and couldn't be
visually verified without Docker this session.

Verified with npm run check/build.

web-player/src/lib/components/ui/AccountMenu.svelte

@@ -9,6 +9,7 @@
 	import MenuItem from './MenuItem.svelte';
 	import GlassMenu from './GlassMenu.svelte';
 	import { themeMode } from '$lib/theme/mode.svelte';
+	import { clickOutside } from '$lib/actions/clickOutside';
 
 	interface Props {
 		user: SessionUser;
@@ -27,7 +28,6 @@
 	}: Props = $props();
 
 	let open = $state(false);
-	let menuRef: HTMLDivElement | undefined = $state();
 
 	function toggle() {
 		open = !open;
@@ -36,13 +36,9 @@
 	function close() {
 		open = false;
 	}
-
-	function onDocumentClick(event: MouseEvent) {
-		if (menuRef && !menuRef.contains(event.target as Node)) open = false;
-	}
 </script>
 
-<div class="relative" bind:this={menuRef}>
+<div class="relative" use:clickOutside={close}>
 	{@render trigger({ toggle, open })}
 
 	{#if open}
@@ -69,5 +65,3 @@
 		</GlassMenu>
 	{/if}
 </div>
-
-<svelte:window onclick={onDocumentClick} />

web-player/src/lib/components/ui/AlbumCard.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
 	import MediaCard from './MediaCard.svelte';
 	import Artwork from './Artwork.svelte';
+	import { plural } from '$lib/format';
 
 	interface Props {
 		id: string;
@@ -35,9 +36,7 @@
 			typeLabel,
 			subtitle,
 			releaseYear ? String(releaseYear) : undefined,
-			trackCount === undefined
-				? undefined
-				: `${trackCount} ${trackCount === 1 ? 'canción' : 'canciones'}`
+			trackCount === undefined ? undefined : plural(trackCount, 'canción', 'canciones')
 		]
 			.filter((part) => !!part)
 			.join(' · ')

web-player/src/lib/components/ui/PlaylistCard.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
 	import MediaCard from './MediaCard.svelte';
 	import Artwork from './Artwork.svelte';
+	import { plural } from '$lib/format';
 
 	interface Props {
 		id: string;
@@ -13,7 +14,7 @@
 
 	let { id, name, trackCount, trackIds, updatedAt, index = 0 }: Props = $props();
 
-	const subtitle = $derived(`${trackCount} ${trackCount === 1 ? 'Canción' : 'Canciones'}`);
+	const subtitle = $derived(plural(trackCount, 'canción', 'canciones'));
 </script>
 
 <MediaCard href="/playlists/{id}" title={name} {subtitle} {index}>

web-player/src/lib/components/ui/TrackTitleCell.svelte

@@ -3,6 +3,7 @@
 	import Artwork from './Artwork.svelte';
 	import ExplicitBadge from './ExplicitBadge.svelte';
 	import ArtistLink from './ArtistLink.svelte';
+	import { pressable } from '$lib/actions/pressable';
 
 	interface Props {
 		trackId: string | number;
@@ -33,24 +34,14 @@
 		overlay,
 		badge
 	}: Props = $props();
-
-	function onKeydown(event: KeyboardEvent) {
-		if (event.key !== 'Enter' && event.key !== ' ') return;
-		event.preventDefault();
-		onClick();
-	}
-
-	function onclick(event: MouseEvent) {
-		event.stopPropagation();
-		onClick();
-	}
 </script>
 
+<!-- svelte-ignore a11y_click_events_have_key_events -->
 <div
 	role="button"
 	tabindex="0"
-	{onclick}
-	onkeydown={onKeydown}
+	use:pressable={onClick}
+	onclick={(event) => event.stopPropagation()}
 	class="flex min-w-0 items-center gap-3.5 text-left"
 >
 	<Artwork trackIds={[trackId]} src={coverSrc} {size} alt={title} class="shrink-0">